/**
 * 常量枚举
 *
 *  const enum XXX {
 *
 *  }
 *
 *   1. 常量枚举在编译成 JS 的时候，不会生成 枚举名字的对象
 */

const enum Direction {
  Up = "UP",
  Down = "DOWN",
  Left = "LEFT",
  Right = "RIGHT",
}

let dir: Direction = Direction.Up;

export default {};
